Furnace



FuRNAcE.

APPLICATION FILED FEB. 9,19l8.

Patented Dec. 28, 1920.

0. H. HERTEL.

UNITED ISTATES PATENT OFFICE.

OTTO H. HERTEL- 0F GLENELLYN, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO KREHBIEL COMPANY, OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

Specification of Letters Patent.

FURNACE.

Patented Dec. 28, 1920.

Application filed February 9, 1918. Serial No. 216,201.

T0 all whom t may cof/werp.'

Be it known that I, O'r'ro H. HERTEL, a citizen of the United States, and a resident of Glenellyn, in the county of Dupage and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

My invention relates to furnaces and particularly to improved arch construction and arrangement particularly adaptable for application to two-zone furnaces.

rl`he object of the invention is to provide a simple arch structure and improved means for supporting it within the combustion chamber and for connecting it with water legs for the circulation of the boiler water. Another object of the invention is to provide such construction that the arch can be readily installed in existing furnaces and at little expense. Another object is to provide a construction which will make the arch practically self-cleaning.

The above and other features of the invention are fully disclosed on the accompanying drawing in which- Figure 1 is a side elevational view, partly in section, of a furnace in which my improved arch is installed,

Fig. 9. is a sectional view on plane 2 2, Fig. 1, and

Fig. 3 is a perspective view of the arch.

A represents a furnace whose combustion space is dividedby the arch structure B into the two combustion zones c and d, there being the space below the arch for transfer of fuel from the Zone c to the Zone (Z. and g represent the water legs having sheet metal sides and connected in any suitable manner, (not shown) with the boiler h. My improved arch structure may be cast or may be constructed of boiler iron. It is of general rectangular shape and of a width to extend across the combustion space be-l tween the water legs f and g. The rectangular body 5 of the arch has the hollow flange extensions 6 and 7 at the lower corners andthe hollow flange extensions 8 and 9 at the upper corners. The outer wall of each flange has an interior boss or thickened section 10 through which extends an opening 11 for receiving'a water conducting nipple 12. theadjacentinnerrside walls of the water legs having openings 13 for registering with the openings 11vand to receive the inner ends ofthe nipples. These short pipe sections or nipples may be inserted into the openings 11 from the outside thereof before the arch is applied or may be inserted through openings 14 in the inner walls of the flanges, for which openings closure plugs 15 are provided. After the arch is located in the combustion space of the furnace with its openings 11 in registration with the openings 13 of the water legs the nipples are extended through the openings into the water legs and then by suitable apparatus the projecting ends of the nipples are deflected or beaded over and against the adjacent wall sides, as indicated at 16, these nipples then serving as rivets for securely fastening the arch against and to the inner walls of the vwater legs. No special means are therefore necessary to hold the arch in place. After the nipples have been beaded over the plugs 15 are inserted and then the arch interior is connected through the nipples with the watery legs for the circulation of boiler water therethrough, and just that much boiler capacity is added to the furnace.

The lower wall 17 of the arch is preferably arched or domed upwardly so that anyv sediment can flow laterally into the pockets 18 of the lower flanges and removed from there through the openings 14 after removal of the plugs 15. The spaces 19 in the upper flanges 8 and 9 serve as expansion or cush? ioning chambers should steam be generated in the arch. In order to relieve the arch of any such steam, pipes 20 are connected at their lower ends with the outer ends of the nipples in the upper flanges, and these pipes extend upwardly through the water legs' and communicate at their upper ends with the steam dome or with the boiler above the water level; Thus during any undue expansion, or generation of steam inthe arch, relief can be had through these pipes and the arch protected. y

In two-zone furnaces it may be desirable to have ports or passageways from the upper part of one Zone to the lower part of the other, and such passageways preferably provide through the arch in the form of pipes 21 so that the ,heat ofthe gases or products of'combustion flowing through the pipes may be taken up by the water in the arch. As shown, the pipes Q1 are Z-shaped and are inserted through the threaded openings 22 in the top wall ofthe arch, the lower ends of the pipesI deflecting rearwardly through the rear wall of the arch and beaded thereto as indicated at 23. The upper ends of the pipes deflect forwardly to communicate with the front combustion Zone c and are surrounded by the brickwork 24 which fills in the space between the top of the combustion space and the top of the arch. Threaded bushings 25 screw into the openings 22 and secure the pipes to the upper wall of the arch. Instead of using` pipes, ports or passageways could be formed by casting walls integral with the arch, and then -short pipes extended upwardly and forwardly from the upper ends of these ports, if it is desired to have the port entrance from combustion zone c at a point above the top of the arch.

1 thus provide a very simple and inexpensive arch structure and simple and inexpensive means whereby such structure can readily be supported in a furnace and connected with the water space thereof to add its capacity to that of the boiler.

1 do not, of course. desire to be limited to the exact construction and arrangement shown and described as changes and modifications may be made which would still come vwithin the scope of the invention.

I claim as follows:

1. The combination with a furnace having a combustion chamber, a boiler and water legs connected with the `boiler and forming the side wall of said combustion chamber, a metallic arch structure extending between said water legs and comprising hollow flanges at the corners of said arch and abutting against said water legs. there being provided registeringopenings in the abutting walls of said arch structure and water legs, nipples inserted in said registering openings and having their ends beaded over the inner side of the abutting walls, and means permitting the insertion of said nipples into said openings from the interior of the furnace.

2. The combination with a furnace having a combustion chamber, a boiler* and water legs connected therewith and forming side walls for said combustion chamber, an arch structure extending transversely across said combustion chamber for dividing said combustion chamber into front and rear combustion zones, said arch structure being hollow and engaging with its ends against the inner walls of said water legs, hollow fianges formed at the corners of said arch structure, openings through 'said outer walls of said flanges and registering openings in the inner' walls of said water legs, nipples -fin' said registering openings' for supporting the: arch struct-ure and affording communication Afor water between 'the water legs and the arch structure, the 'inner walls of said lfiange's having bpenings in' register with said nipple openings, and rcmovable plugs for said latter openings.

3. The combination with a furnace having a combustion chamber, a boiler and water legs connected therewith and forming side walls for said combustion chamber, an arch structure extending transversely across said combustion chamber for dividing said combustion chamber into front and rear combustion Zones,h said arch structure being hollow and engaging with its ends against the inner walls of said water legs, hollow flanges formed at the corners of. said arch structure, openings through said outer walls of said flanges and registering openings in the inner walls of said water legs, nipples in. said registering openings for supporting the arch structure and affording communication for water between the water legs and the arch structure, the inner walls of said flanges having openings in register with said nipple openings, and removable plugs for said latter openings, said plug openings being of a. diameter to permit insertion therethrough of said nipples.

4l. The combination with a furnace having a combustion chamber, a boiler and water legs connected therewith and forming side walls for said combustion chamber. an arch structure extending transversely across said combustion chamber to divide it into front and rear combustion Zones, said arch structure being yof metal and hollow,

hollow flanges at the corners of said arch structure, openings in the outer walls of said fianges and registering openings in the inner walls of said water legs engaged by the arch structure side walls, nipples within said registering openings having their ends turned over to secure the arch structure and to afford communicating passageway between the arch structure and the water legs. plug openings in the inner walls of said flanges opposite the nipple receiving openings, said plug openings being of a size to permit insertion of the nipples in their receiving openings and the insertion of suitable tools for riveting over said nipples, and removable closure plugs for said plug openings.

5. The combination with a furnace having a combustion chamber, a boiler and water legs connected therewith and forming side walls for said combustion chamber, an arch structure extending transversely across said combustion chamber to divide it into front and rear combustion zones, said arch ,structure being of metal and hollow, hollow flanges at the lower corners of said arch structure, the outer walls of said flanges being in line with the ends of'said arch structure and such ends'engaging against openings, nipples in said registering openings secured to the surrounding walls, the lower wall of said arch being domed or arched for the flow of dirt into the interior of said flanges, and plugged openings in the inner walls of said flanges for the removal of the collected dirt.

6. The combination with a furnace having a combustion chamber, a boiler and water legs connected therewith forming side walls for said combustion chamber, of a hollow metallic arch structure extending transversely across said combustion chamber with its end walls in engagement with the inner walls of said water legs, hollow flanges at the lower corners of said arch structure, the outer walls of said flanges being in line with the end walls of said arch structure, registering openings in the outer walls of said flanges and the adjacent walls of said water legs, nipples secured in said registering openings, hollow flanges at the upper corner of said arch structure, there being registering openings between the outer walls of said flanges and the adjacent walls of said water legs and nipples secured in said registering openings, said nipples serving to secure said arch and to afford communicating passageway between the interior of the arch and the water legs, and pipes connecting at their lower ends with the upper nipples and extending through said water legs and terminating at their upper ends above the water level.

7. The combination with a furnace having a combustion chamber, a boiler and water legs connected therewith and forming side walls for said combustion chamber, of a hollow metallic arch structure extending transversely across said combustion chamber with its end walls in engagement with the inner walls of said water legs, hollow flanges at the lower corners of said arch structure, the outer walls of said flanges being in line with the end wallsI of said arch structure, registering openings in the outer walls of said flanges and the adjacent walls of said water legs, nipples secured in said registering openings, hollow flanges at the upper corner of said arch structure, there being register ing openings between the outer walls of said flanges and the adjacent walls of said water legs and nipples secured in said registering openings, said nipples serving to secure said arch and to aord communicating passageway between the interior of the arch and the water legs, pipes connecting at their lower ends with the upper nipples and extending through said water legs and terminating at their upper ends above the water level, and plugged openings in the inner walls of said flanges opposite the nipples.

8. The combination -with a furnace having a combustion chamber, a boiler and water legs connected therewith and forming side walls for said combustion chamber, an arch structure extending transversely across said combustion chamber for dividing said combustion chamber into front and rear com bustion zones, said arch structure being hollow and engaging with its ends against the inner walls of said water legs, hollow flanges formed at the ends of said arch structure, openings through said outer walls of said flanges and registering openings in the inner walls of said water legs, nipples in said registering openings for supporting the arch structure and affording communication for water between the water legs and the arch structure, the inner walls of said flanges having openings in register with OTTO H. HERTEL. 

